.mask{
	width: 100%;
	height: 100%;
	background-color: rgba(242,242,242, 0.5);
	position: fixed;
	left: 0;
	top: 0;
	text-align: center;
	display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
  	align-items: center;
    -webkit-justify-content: center;
  	justify-content: center;
}

.scroll-off{
	position:fixed;
	overflow-y:hidden
}
